Can diazepam be used to treat restless‑leg syndrome in an elderly patient with jerking movements (periodic limb movements)?

Do Not Use Diazepam for Restless Leg Syndrome in Elderly Patients

The American Academy of Sleep Medicine (AASM) 2025 guidelines explicitly recommend against using benzodiazepines, including diazepam, for treating restless legs syndrome (RLS), even in elderly patients with periodic limb movements. 1

Why Benzodiazepines Are Not Recommended

The most recent and authoritative evidence is clear:

• The AASM suggests against the use of clonazepam (the most studied benzodiazepine for RLS) with very low certainty of evidence 1
• While diazepam is not specifically mentioned in the guidelines, it falls under the benzodiazepine class that is not recommended
• A 2017 Cochrane systematic review found zero randomized controlled trials meeting inclusion criteria for benzodiazepines in RLS treatment, concluding that "the effectiveness of benzodiazepines for RLS treatment is currently unknown" 2

Specific Concerns in the Elderly

Diazepam poses particular risks in elderly patients:

• Increased risk of falls, cognitive impairment, and respiratory depression in older adults
• Profound sedation when combined with other CNS depressants 3
• Physical dependence and withdrawal seizures with prolonged use 3
• Slower metabolism in elderly patients increases sedation risk 4

What Benzodiazepines Actually Do (and Don't Do)

While older studies showed clonazepam improved subjective sleep quality, the critical finding is that benzodiazepines do not reduce periodic limb movements 5. They merely mask the problem by sedating the patient, not treating the underlying pathophysiology. A 2023 meta-analysis confirmed that clonazepam showed "contradictory results" for PLMS suppression 6.

Recommended Treatment Algorithm for Elderly RLS Patients

First-Line Treatments (Strong Recommendations):

1. Gabapentin - AASM strongly recommends (moderate certainty) 1
2. Pregabalin - AASM strongly recommends (moderate certainty) 1
3. IV ferric carboxymaltose if ferritin <75 ng/mL or transferrin saturation <20% - AASM strongly recommends (moderate certainty) 1

Second-Line Options (Conditional Recommendations):

• Oral ferrous sulfate if iron deficient (moderate certainty) 1
• Extended-release oxycodone or other opioids (moderate certainty) 1
• Dipyridamole (low certainty) 1

Avoid as Standard Treatment:

• Dopamine agonists (pramipexole, ropinirole, rotigotine) - now downgraded due to augmentation risk 1, 7
• All benzodiazepines including diazepam 1

Clinical Pitfalls to Avoid

1. Don't confuse sedation with treatment - benzodiazepines may help patients fall asleep but don't address RLS pathophysiology
2. Check iron studies first - ferritin and transferrin saturation should guide iron replacement, which can be curative
3. In elderly with cognitive impairment, use modified diagnostic criteria focusing on behavioral indicators rather than patient self-report 4
4. Screen for secondary causes - iron deficiency, renal failure, peripheral neuropathy, and offending medications (antidepressants, antipsychotics, antihistamines) 8, 9

Bottom Line

Start with gabapentin or pregabalin, check and correct iron deficiency, and avoid diazepam entirely. The 2025 AASM guidelines represent the highest quality, most recent evidence available and explicitly recommend against benzodiazepine use in RLS 1. The elderly population faces even greater risks from benzodiazepines without proven benefit for the underlying condition 10, 4.